I know the original Ecto had 48" Force 4 XL lightbars with the speaker grille in the middle and blue domes. According to the reference section of GBfans, "The Ecto-1a had the same make and model, but with clear domes, not blue, also with the chrome strip across the top. Instead of the speaker grill in the center there was another clear dome, also with single rotators.", but 1A's lightbars look wider in the photos. Are the clear ones 48" or the 54" lightbars? Notice the difference in the width of the center section. Also notice that the speaker grille only has 2 bolts holding it on the front, while the clear center dome has 3 bolts (visible in the third photo)...